Decades ago, men in white coats at the BBC spent much of their time designing speaker systems with the accurate reproduction of human voice as the ultimate goal. How well they succeeded in their mission is down to the individual listener (I think they got it largely right) but having heard a great many loudspeakers, some really do destroy the tonality and coherence required to get speech right. A good clean voice recording can really highlight cone/dome/cabinet related resonances and will also highlight any crossover problems. It can highlight the various honks and quacks that make loudspeaker reproduced voice unnatural. On the flip side, some emphasis around the presence range, while detracting from ultimate sonic fidelity can actually improve intelligibility to some listeners. Is this aspect of performance important to you? To help you assess the performance of your loudspeakers, here is a short speech recording made by Alan Shaw and Derek Hughes (Harbeth) at the old BBC Kingswood Warren anechoic chamber. This is a good clean mono speech recording and a stern test for your system. I can't see any restriction on use and it is freely available to download. Have a listen - the discussion is also very interesting, as is the recording venue as this was used to develop many of the famous BBC speaker designs. [URL]http://www.audiosmile.com/forum/soundfiles/Speech.mp3[/URL]